{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2023-53358", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-09-17T14:54:09.732Z", "datePublished": "2025-09-17T14:56:48.812Z", "dateUpdated": "2026-08-05T09:13:38.694Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T09:13:38.694Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix racy issue under cocurrent smb2 tree disconnect\n\nThere is UAF issue under cocurrent smb2 tree disconnect.\nThis patch introduce TREE_CONN_EXPIRE flags for tcon to avoid cocurrent\naccess." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:N - ksmbd is the in-kernel SMB server reached over TCP/445; smb2_tree_disconnect() is invoked from handle_ksmbd_work() solely on SMB2_TREE_DISCONNECT PDUs from a remote peer, with no local access required.\nAC:L - The attacker controls both sides of the race by issuing concurrent SMB2_TREE_DISCONNECT requests for the same TreeId (parallel ksmbd-io workqueue items via SMB credits) and can retry indefinitely until both paths observe the same tcon before TREE_CONN_EXPIRE exists.\nPR:L - smb2_check_user_session() and smb2_get_ksmbd_tcon() gate TREE_DISCONNECT behind an established session and tree connect, so a low-privileged SMB share user (including guest where mapped) is required; this is post-authentication, not a pre-auth path.\nUI:N - The attacker performs negotiate, session setup, tree connect, and concurrent tree disconnects entirely on its own connections; no victim or administrator action is needed.\nS:U - The use-after-free corrupts ksmbd kernel heap state within the same host kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Concurrent disconnect double-frees struct ksmbd_tree_connect (share_conf/user pointers), a sprayable slab UAF that yields arbitrary kernel read primitives once the object is reclaimed, consistent with ZDI-CAN-20592 RCE classification.\nI:H - The second disconnect path reads tree_conn fields from freed memory then kfree()s again, enabling heap spray to hijack control flow / arbitrary write; ZDI rates this as remote code execution in kernel context.\nA:H - Even without full exploitation, the double-free/UAF reliably oopses or panics ksmbd worker threads and can be triggered repeatedly over the network to deny service." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/ksmbd/mgmt/tree_connect.c", "fs/ksmbd/mgmt/tree_connect.h", "fs/ksmbd/smb2pdu.c" ], "versions": [ { "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "b36295c17fb97424406f0c3ab321b1ccaabb9be8", "status": "affected", "versionType": "git" }, { "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "bd80d35725a0cf4df9307bfe2f1a3b2cb983d8e6", "status": "affected", "versionType": "git" }, { "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "dc1c17716c099c90948ebb83e2170dd75a3be6b6", "status": "affected", "versionType": "git" }, { "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "39366b47a59d46af15ac57beb0996268bf911f6a", "status": "affected", "versionType": "git" }, { "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "30210947a343b6b3ca13adc9bfc88e1543e16dd5", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/ksmbd/mgmt/tree_connect.c", "fs/ksmbd/mgmt/tree_connect.h", "fs/ksmbd/smb2pdu.c" ], "versions": [ { "version": "5.15", "status": "affected" }, { "version": "0", "lessThan": "5.15", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.145", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.28", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.2.15", "lessThanOrEqual": "6.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.3.2", "lessThanOrEqual": "6.3.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.4", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "5.15.145" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.1.28" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.2.15" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.3.2" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.4" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/b36295c17fb97424406f0c3ab321b1ccaabb9be8" }, { "url": "https://git.kernel.org/stable/c/bd80d35725a0cf4df9307bfe2f1a3b2cb983d8e6" }, { "url": "https://git.kernel.org/stable/c/dc1c17716c099c90948ebb83e2170dd75a3be6b6" }, { "url": "https://git.kernel.org/stable/c/39366b47a59d46af15ac57beb0996268bf911f6a" }, { "url": "https://git.kernel.org/stable/c/30210947a343b6b3ca13adc9bfc88e1543e16dd5" } ], "title": "ksmbd: fix racy issue under cocurrent smb2 tree disconnect", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 7, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH" } }, { "other": { "type": "ssvc", "content": { "id": "CVE-2023-53358", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "version": "2.0.3", "timestamp": "2026-01-14T18:43:24.919171Z" } } } ], "problemTypes": [ { "descriptions": [ { "lang": "en", "type": "CWE", "cweId": "CWE-416", "description": "CWE-416 Use After Free" } ] } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-01-14T18:52:59.942Z" } } ] } }